Remove rabbitmq vars from aodh playbook
Remove rabbitmq vars from aodh playbook

These vars no longer belong here - they're a legacy implementation.
This patch cleans them up to ensure there's no confusion.

Change-Id: I749f13551ac4dce74dca9577212126bfe13d02e8

openstack/openstack-ansible,stackforge/os-ansible-deployment,openstack/openstack-ansible,stackforge/os-ansible-deployment